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SUMMARY:Open-channel separating-flows
DTSTART:20121217T121500
DTEND:20121217T131500
DTSTAMP:20260408T142505Z
UID:0fcdcc3160f3c165f7951bb4b89ab6389287a3fa5873e4e0cac121d2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Emmanuel Mignot\nIn the field or in laboratory condition
 s\, as a flow reaches a geometrical singularity\, it usually detaches from
  the wall. A recirculation zone (also named “bubble”) takes place alon
 g this wall. The typical velocity magnitude in the recirculation zone is a
 t least an order of magnitude lower than that of the main flow. Meanwhile\
 , the main flow accelerates as the flow section is reduced. Consequently\,
  a mixing layer takes place between the rapid main flow and the slow recir
 culating flow and this mixing layer strongly rotates from the detachment p
 oint towards downstream. Analysis of such separating mixing layer thus req
 uires the use of a local frame-axis.\nWe investigate a separating flow on 
 an experimental set-up of open-channel bifurcation with one incoming and t
 wo outing flows. Time-averaged PIV data permit to characterize this mixing
 -layer in terms of mean and turbulent flow characteristics. Moreover\, a c
 omparison between the analysis using Cartesian and local frame-axis confir
 ms that the second methodology is much more convenient. We show for instan
 ce that the failure of eddy-viscosity concept in Cartesian frame-axis can 
 be explained based on geometrical aspects and can be corrected using a loc
 al frame-axis.\nBio: Emmanuel Mignot is assistant professor at INSA (Lyon\
 , France) for his academic work and LMFA (Laboratory for Fluid Mechanics a
 nd Acoustics\, Lyon\, France) for his research activities. His research is
  mainly based on an experimental approach and is dedicated to urban floodi
 ng and environmental fluid mechanics. Specific attention is paid towards c
 omplex mixing-layer configurations such as lateral cavities\, junction and
  bifurcation flows\, sudden flow enlargements\, and flows around obstacles
 .
LOCATION:GC D0 386
STATUS:CONFIRMED
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